I would like to understand this design then. In my experience it has only served to limit what I can achieve, and gained me no additional benefit.

Is there an OS agnostic way of doing this? I like the script command on macOS because you don't have to wrap the command in quotes. The script runs and sends output to the tty which is duplicated in the supplied file, but I can't seem to get the linux version to behave the same way... I'm probably doing something wrong. So what's the equivalent linux script command for this on macOS: script -q -t 0 tmp.out perl -e 'print "Test\n"' Test cat tmp.out Test

So I was wondering: do you have any examples of broken source maps caused by this approach? I don't use source maps so it'd be nice to have something to start from.

Is there some documentation yet, or maybe tests with some code examples?

function fn1<T extends string>(x: T): T { return "hello world!"; } How to resolve this error? Change to return "hello world" as T?